J.R.R. Tolkien used the term eucatastrophe for a sudden joyful turn that brings a fairy-story to a happy resolution.
Tolkien introduced the word in his 1939 lecture and essay “On Fairy-Stories.” He formed it from the Greek prefix eu-, meaning “good,” and catastrophe, meaning a decisive reversal or outcome. For Tolkien, eucatastrophe was not merely a surprise ending; it was the sudden turn from apparently unavoidable disaster toward joy.
He described it as the highest function of a true fairy-story and connected it with the Christian idea of joy beyond despair. A famous example in The Lord of the Rings occurs when the Ring is destroyed and the long crisis reaches its decisive reversal, although Tolkien’s concept applies more broadly than to that single scene.
Eucatastrophe is often confused with deus ex machina. Tolkien’s term emphasizes emotional and spiritual joy, while deus ex machina usually describes an external intervention that abruptly resolves a plot.